Online Armor Personal Firewall is a firewall developed by Tall Emu Pty Ltd that provides protection on a Microsoft Windows operating system from both inbound and outbound attacks. It comes in both free-for-personal-use and commercial versions. Though compatible with only Windows NT, 2000, and XP, the possibility of creating a version compatible with Vista is being investigated. The freeware version has somewhat limited features compared to marketed versions. Most notably, it lacks the ability to update the software or definitions. Thus, product upgrades must be manually downloaded from its website.
In a recent independent firewall test performed by matousec.com , Online Armor was the first firewall to receive a perfect score, surpassing more well-known firewalls, such as ZoneAlarm and Kaspersky Internet Security. A well known vulnerability profiling site and company, Secunia, had not found any vulnerabilities as of March, 2008 in the software, though Matousec reported a weakness 25th of March, 2008 that has been repaired in the latest version.
Online Armor has gained both negative and positive feedback during its fairly short existence, with some users reporting serious compatibility problems with certain programs, such as F-Secure and Ad Muncher, as noted in the product website, but also receiving praise for its free online support and for its swift response to problems.